I just find the galaxy so much faster for things i want to do, its just like an iphone but NOT andriod is so polished, im a heavy poker player so Full Tilt Poker have released an Andriod only client and that sealed the deal for me, i can win and loose money on the go. But all around the Galaxy S even though its an older phone its still up there with the best of them.
Only downfall is the 8gb internal mem, which sucks, and battery life is worse than the n900, i dont run stock firmware on the S though i have a custom Darky Rom which is awsomeeee